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Biogenesis of c-type cytochromes in alpha- and gamma-proteobacteria requires the function of a set of orthologous genes (ccm genes) that encode specific maturation factors. The Escherichia coli CcmE protein is a periplasmic heme chaperone. The membrane protein CcmC is required for loading CcmE with heme. By expressing CcmE (CycJ) from Bradyrhizobium japonicum in E. coli we demonstrated that heme is bound covalently to this protein at a strictly conserved histidine residue. The B. japonicum homologue can transfer heme to apocytochrome c in E. coli, suggesting that it functions as a heme chaperone. CcmC (CycZ) from B. japonicum expressed in E. coli was capable of inserting heme into CcmE.

journal of bacteriology

Interspecies Complementation of Escherichia coli ccm Mutants: CcmE (CycJ) from Bradyrhizobium japonicum Acts as a Heme Chaperone during Cytochrome c Maturation